Issue Summary

If the panel macro's background colour is kept at the default value (empty), it is white in the legacy editor view mode, but it shows grey in the space-level PDF export.

This issue happens only in V1 PDF export
This issue only happens with space-level PDF export, no issue for page-level PDF export
This issue only happens to the default setting (empty), For a specific background colour hex value, the colour in the export PDF file is correct.

Steps to Reproduce

1. Edit a legacy page and add a panel macro, keep the background colour is empty
2. Check this macro background colour in view mode, it is white
3. Do space-level PDF export for this page
4. Check the background colour for this macro in the exported file

Expected Results

The background colour for this panel macro should be white in the export PDF file, the same as it shows in view mode

Actual Results

The background colour for this panel macro is grey in the exported PDF file.

Workaround

Manually add the colour hex code (for example, #FFFFFF) in the "Background Colour" field of the panel macro